Uruma Naruse, Fujita & Ng, 2009

Ahyong, Shane T. & Ng, Peter K. L., 2009, Aphanodactylidae, a new family of thoracotreme crabs (Crustacea: Brachyura) symbiotic with polychaete worms, Zootaxa 2289, pp. 33-47 : 44-46

Uruma Naruse, Fujita & Ng, 2009

( Figs. 6 , 7 B)

Uruma Naruse, Fujita & Ng, 2009: 60 [type species: U. ourana Naruse, Fujita & Ng, 2009 , by monotypy].

Diagnosis. Carapace wide, trapezoidal, margins cristate, but not continuous to external orbital end, epimeral suture just inferior to carapace proper; surface smooth, glabrous. Front narrow, deflexed medially, triangular in frontal view. Orbit oblique, mesial part of supraorbital margin placed more posteriorly than external orbital end; orbital margins entire, outer part granulated, infraorbital margin mesially terminating in sharp tooth; supraorbital margin demarcated from antennular fossa by obtuse angle; supraorbital margin demarcated from antennular fossa by acute tooth; infraorbital and supraorbital margins not continuing laterally beyond orbit proper. Eyes short, mobile, fully occupying orbit. Epistome short, medially sunken. Maxilliped 3 covering about 4/5 of buccal cavern. Thoracic sternites 1 and 2 completely fused, sternite 1 tooth-like, directed dorsally at proximal end of buccal cavern; sternites 2 and 3 demarcated by deep groove; sternites 3 and 4 fused, lateral parts marked by very shallow depressions and pits; sternites 4–8 demarcated by narrow lateral grooves at outside of sternal cavity, grooves ending at lateral parts of sternal cavity; sternal cavity depressed medially, no clear longitudinal groove. Cheliped merus with large transverse and triangular lobe on subdistal part of dorsal margin. P2–4 similar in shape, P3 longest; meri about 3 times as long as high, about 1.5 times length of propodus and carpus length combined; carpus longer than propodus. P5 merus slightly longer than carpus and propodus combined, about twice as long as high, just reaching proximal half of P4 merus; distal end of ischium and proximal end of merus each with single sharp tooth on flexor margin. P2–5 all with single pair of short, sharp claw on distoflexor angle of propodi; dactyli very short, claw-like. Male abdomen with all somites freely articulating, first somite widest. Thoracic sternite 8 exposed when abdomen closed, somite 3 to telson forming triangular outline. G1 straight, slender, distally tapering incurved. G2 small, about ¼ length of G1.

Included species. Monotypic.

Material examined. Uruma ourana Naruse, Fujita & Ng, 2009 : RUMF-ZC-907, holotype male, cl. 4.2 mm, cw. 9.2 mm, Oura Bay, Okinawa, Ryukyu Is., Japan, 8 m, from a tube of unidentified worm, coll. M. Obuchi, 28 July 2007.

Remarks. Uruma ourana was recently described in detail by Naruse et al. (2009) and is presently known only from the male holotype collected from Okinawa.

Figures

FIGURE 6. Uruma ourana Naruse, Fujita & Ng, 2009, male holotype, cl. 4.2 mm, cw. 9.2 mm (RUMF-ZC- 907). A, cephalothorax, anterior view. B, right maxilliped 3. C, left P 4, dorsal view. D, propodus and dactylus of left P 4, ventralinner view. E, right P 5, dorsal view. F, abdomen. G, right G 1, abdominal view. H, right G 2, thoracic sternal view. Scales: A = 1.0 mm; B = 0.8 mm; C, E = 1.5 mm, D = 1.3 mm; F = 2.0 mm; H, G = 0.5 mm. (After Naruse et al. 2009: figs. 3, 4).

FIGURE 7. A, Gustavus mecognathus n. gen., n. sp., male holotype, cl. 6.1 mm, cw. 8.8 mm (ZRC) (lower) and female paratype, cl. 8.0 mm, cw. 13.9 mm (ZRC) (upper) (photo: G. Paulay). B, Uruma ourana Naruse, Fujita & Ng, 2009, male holotype, cl. 4.2 mm, cw. 9.2 mm (RUMF-ZC- 907) (after Naruse et al. 2009: fig. 1).